Using the right format of textures.
-PAA textures with transparecny for all objects. Use them only if you really want half transaprency,eg glass.
-PAA format is good for BLACK/WHITE(desaturated) textures,BIS use them in resistance on weapons,after converting textures stay only in black/white colors.
-As you see on pic,PAA black/white texture looks better then PAC:
How to do it?
Save black/white texture in TGA,then desaturate it in Photoshop (ctrl+shift+u) a then convert to PAA,done.
-As you can see on this pic,using PAA textures is not always the best way...
For this is better use PAC textures.
-Use it all the time ;)
-PAC support more colors then PAA
-Creating PAC with transparency-(using GIF format)-Good for trees,bushes etc...
Fill the Invisible space on texture,use color 255 0 255 (R-G-B).
Pic from photoshop:
Then File>Save for web...(GIF)
When you converted it in PAC you?ll see: